Improvement in machines for sewing boots and shoes



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Improvement in Machines for Sewing Boots and Shoes.

No, 124,337, PatentedMarch5,1872.

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improvement in Machines for Sewing Boots and Shoes. No. 124,337, Patented March5,i872.

1 72 van 82 1' UNITED STATES ATENT @rrron.

OHAUNCEY O. CROSBY, OF MILFORD,ASSIGNOR TO THE CROSBY WELTED- AND-TURNED-SOLE SEWING-MACHINE COMPANY, OF NEW HAVEN,

CONNECTICUT.

IMPROVEMENT IN MACHINES FOR SEWING BOOTS AND SHOES. I

Specification forming part of Letters Patent No. 124,337, dated March 5, 1872.

To all whom it may concern:

Be it known that l, UHAUNCEY O. CRosnY, of Milford, in the county of New Haven and State of Connecticut, have invented a new Improvement in Machines for Sewing Boots and Shoes; and I do hereby declare the following, when taken in connection with the accompanying drawin gand the letters ofreference marked thereon, to be a full, clear, and exact description of the same, and which said drawing constitutes part of this specification, and represents, in-

Figure 1, a side View of the needle, shuttlerace, and mechanism in immediate connection therewith, full size; and in Fig. 2, a side View of the machine on a reduced scale.

This invention relates to an improvement in machine for sewing boots and shoes, for turned work, or to secure the weltand upper to the sole for welted work, the object being to perform this work with what is known as the lockstitch, to overcome the difiiculties which exist in the use of the chain-stitch, it being well known that the elasticity which is unavoidable in the chain-stitch prevents that close or firm work which is desirable in boots and shoes, and which is attained by handstitching, which latter or nonelastic stitch the shuttle-stitch more nearly approaches.

This invention is an improvement upon and embodying some of the elements in the machine for which Letters Patent were granted to me May 23, 1869.

1n sewing turned work, also in stitching the welt and upper to the insole, the pointof the needle must enter a channel in one side of the sole and leave the sole at the same side, but near the edge of the sole; it therefore reciprocates in a path inclined to the path or plane occupied by the surface of the sole; and the object of my invention is to adapt aneedle operating in this manner to operate with a shuttle to form a lock-stitch and the first part of my invention consists in a shuttle-race arranged at the sole of the shoe, and in such a position that the needle passes through the race at an angle or diagonal to the path traversed by the shuttle, rather than at right angles to such path, as common in'othersewingmachines. In order to insure the lock of the two threads being drawn into the work, the second part ot'the invention consists in impel-t in g to the shuttle a retreating movement after the two threads have been drawn taut, and just as the needle is reaching its extreme back movement, and to such an extent that while the two threads are held taut the needle in the last part of its movement will draw the shuttle-thread into the work, causing the lock to lie within it. The third part of this invention, having for its object to prevent the wax from the thread adhering to the shuttle, consists in the arrangement of a lubricating device in connection with the shuttle-race, so that the point of the shuttle will receive a slight amount of lubrication at each throw, which lubrication is carried over the shuttle by the needle-thread as it passes from the point to the heel of the shuttle.

A represents the bed of the machine; B, the

frame, upon which, at C, the shuttle-carrier is hung, this forming the center of the segmental shuttle-race, the shuttle-carrier E being operated by a connecting-rod, E, from a cam, E on the driving-shaft E, as seen in Fig. 2. 1 Fig. 1, is the support upon which the shoe G is placed, this support having universal movement, substantially such as shown in the pattent before referred to. The vertical axis of this support is in a line at right angles to a central radial line, X X, through the center of the shuttle-race, as denoted in Fig. 1, thus practically making the path of the shuttle parallel to the axis of the support for the work.v On the part B of the frame the needle-bar H is arranged in suitable guides, and operated substantially as in my patent before referred to, the said needle-bar carrying the needle h, the path of the said needle being in a line diagonally across the shuttle-race or central line X X, before referred to. L is a plate or bearing upon the outside of the shuttle-race, between that and the needle, and forms what may be termed the work-plate, against which the side of the shoe bears. The shoeis placed in position relatively to the needle, substantially as in my patent bctore refeired to, and as seen in Fig. 1, having the sole M temporarily attached to the upper, and a channel, a, formed around its edge, so that the needle may strike upon the inside of the channel, pass through the ridge on the sole formed by the channel, thence through the upper and welt, if in welted work, thence into the shuttle-race, where the thread which the needle carries is engaged by the shuttleN in the usual manner of common shuttle-sewing machines. As it is necessary that the needle, in order to pass through the ridge of the sole, as before described, should run in a path diagonal to the shoe, because of the curvature of the sole, it follows that the path of the needle must be diagonal to the path of the shuttle, which latter is practically pa allel, as before described, with the work, and this is necessitated because the body and peculiar shape of the shoe prevents the construction of the shuttle-race so as to be at right angles to the path of the needle, and always maintain the same relative position to the edge of the sole.

I have represented the shuttle-race as of segmental form, and this construction I prefer for its convenience; it may, however, be straight, but in such case the needle moves diagonally to the path traveled by the needle.

In order to slackcn the shuttle-thread and insure a proper drawing up of the stitch, which constitutes the second part of my invention, 1 construct the cam F so that the extreme throw 1) occurs immediately before the full return of the needlethat is, so that the slmttle-thread is drawn taut, as denoted in Fig. 8, (s denoting the shuttle-thread,) the needle-threzul at extending entirely through the work, and it the shuttle were there to remain the shuttlethread would lie straight upon that side of the work, but in order that the shuttle-thread may be drawn into the work and positively always to the same point, I so construct the cam F that it allows the shuttle to retreat at little just before the needle completes its throw, slackening the shuttle-thread slightly, but only so fast as the needle recedes, so that both threads being held attheir greatest tension) the needlethread draws the shuttle-thread into the work as at t, Fig. 3, thus positively insuring the perfect drawing up of the stitch and the same relative position regardless of the nature of the leather, whether it be hard or soft, and giving to the stitch upon both sides precisely the appearance of hand-work.

One of the greatest difiieulties in the use of shuttle-machines torsewing with waxed thread arises from the gumming of the shuttle by the wax of the thread, but as the wax will not. adhere to a greasy surface, I provide against this difficulty in the third part of my invention. To do this I arrange in the shuttle-race a lubricating material, P, as seen in Fig. 1, into which the point of the shuttle strikes at each operation, this lubricating material being something of a greasy nature, so that the shuttle receives theret'roinupon its point a slight amount of oil which is carried over the body of the shuttle by the thread, thus keeping the surface of the shuttle constantly greased. I prefer, for this purpose, felt or other fibrous material saturated with oil, but other lubricators may be applied, it only being essential that the point of the shuttle should receive the lubrication.

It will be understood that this device is for u-eventingthe wax from adhering to the shuttle, and not a. device for clearing the wax from the shuttle after it has adhered thereto, this last device having been heretofore used; hence the necessity of the arrangement of the lubricator in the manner described, so that the point will receive the lubricating material before it comes in contact with the thread, and be by the thread carried over the surface of the shuttle.

1 claim as my invention 1. In a sewinganechanism, the combination of a needle carrying one thread, a race, and a shuttle carrying a second thread, when so arranged that the shuttle moves in a path diagonal to the path of the needle, substantially as herein described.

2. In combination with aneedle, race, and shuttle, arranged and operating as above described, I claim the cam F or its equivalent, for operating the said shuttle, substantially as and for the purpose described.

3. ihe arrangement of a lubricating device, in connection with the shuttlerace, so that the point of the shuttle will receive the lubrication, substantial] y as and for the purpose set forth.

(3. 0. CROSBY.

Witnesses:

A. J. TIBBITS, JOHN E. EARLE. 

